Localization challenges researchers for its contradictive goals, i.e., how to
tackle the problem of minimizing energy consumption as well as maintaining
localization precision, which are two essential trade-offs in wireless sensor
network systems. In this paper, we propose an Energy-Efficient Opportunistic
Localization (EEOL) scheme to satisfy the requirement of positional accuracy
and power consumption. We explore the idea of opportunistic wakeup
probability to wake up an appropriate numbers of sensor nodes, while ensuring
the high positional accuracy. Sensor nodes can be triggered by the
opportunistic wakeup probability sent from the user. Through utilizing this
method, the number of active sensors in the sensing range of the user is
decreased, and the power consumption is significantly reduced. Theoretical
analysis has been presented to evaluate the performance of EEOL. Simulation
results show that EEOL confirms our theoretical analysis.